<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .page{
              height: 200px;
              padding: 0 200px;
        }
        .left,.right{
                height: 200px;
                width: 200px;
                background-color: aquamarine;
        }
        .page div{
                   float: left;
        }
        .content{
                    width: 100%;
                    height: 200px;
                    background-color: pink;
        }
        .left{
                  margin-left: -200px;
                  position: relative;
                  left: -100%;
        }
        .right{
                 margin-left: -200px;
                 position: relative;
                 left:200px;   
        }
    </style>
</head>
<body>
    <div class="page">
        <div class="content">主体内容</div>
        <div class="left">广告位</div>
        <div class="right">广告位</div>
    </div>
</body>
</html>